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Mineralization of Carbon and Nitrogen in Soil Amended with Carbon‐13 and Nitrogen‐15 Labeled Plant Material
Author(s) -
Broadbent F. E.,
Nakashima T.
Publication year - 1974
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1974.03615995003800020029x
Subject(s) - nitrogen , loam , chemistry , mineralization (soil science) , agronomy , nitrogen balance , hordeum vulgare , organic matter , nitrogen cycle , nitrogen deficiency , carbon fibers , total organic carbon , soil organic matter , nutrient , soil carbon , environmental chemistry , soil water , environmental science , soil science , poaceae , biology , materials science , organic chemistry , composite number , composite material
Doubly labeled barley ( Hordeum vulgare L.) plants were grown in a closed chamber containing 13 C‐enriched CO 2 and 15 N‐enriched nutrient solution. Tops and roots were separated, ground, and added to Columbia fine sandy loam in fritted glass filter tubes. Soil samples were incubated with continuous flow aeration for 5 years. Evolved CO 2 was trapped for 22 weeks. Mineral nitrogen was leached from the samples at intervals throughout the 5‐year period. After 5 years, only 12% of the carbon from tops and 16% of that from roots remained in soil, compared with 38% of the nitrogen in tops and 57% of the root nitrogen. Average annual losses of carbon from soil organic matter were 6.1–6.8%; annual turnover of nitrogen varied from 6.3 to 7.4%. Availability ratios for nitrogen decreased as a function of time from about 2.5 initially to 1.2 at the end of the incubation period. Unaccounted‐for losses of nitrogen from barley tops and from soil organic matter were 15–17%, but only 2% from roots.